System and Method for Dual-Port Communication and Power Delivery

2. The dual-port circuit of claim 1 wherein in the pass through mode, communication between the first interface and the second interface supports a simplex or half duplex universal asynchronous receiver/transmitter (UART) communication.

3. The dual-port circuit of claim 2 wherein the bidirectional level translation is accomplished by alternatively engaging two inverter gate paths between the first interface and the second interface.

4. The dual-port circuit of claim 1 wherein the pass through mode is timer enabled.

5. The dual-port circuit of claim 1 wherein enablement of the first single wire link or the second single wire link for single wire data communication is controlled by a token pin, when the token pin is set to a first logic level, the first single wire link is set for single wire data communication, when the token pin is set to a second logic level opposite to the first logic level, the second single wire link is set for single wire data communication.

6. The dual-port circuit of claim 5 wherein the token pin outputs a clock signal in the pass through mode.

7. The dual-port circuit of claim 1 wherein the charging activity comprises coupling a voltage source to a battery charger, the battery charger is configured to charge at least one battery.

8. The dual-port circuit of claim 7 wherein the voltage source comprises a charging battery.

9. The dual-port circuit of claim 8 wherein the charging battery has a battery capacity greater than a battery capacity of the at least one battery.

11. The method of claim 10 wherein in the pass through mode, communication between the first interface and the second interface supports a simplex or half duplex universal asynchronous receiver/transmitter (UART) communication.

12. The method of claim 11 wherein enablement of the first single wire link or the second single wire link for single wire data communication is controlled by a token pin, when the token pin is set to a first logic level, the first single wire link is set for single wire communication, when the token pin is set to a second logic level opposite to the first logic level, the second single wire link is set for single wire communication.

13. The method of claim 12 wherein in the pass through mode, the token pin outputs a clock signal.

15. The system of claim 14 wherein the buffer and the dual-port circuit are integrated within a single chip.

16. The system of claim 15 wherein the single chip and the second circuit are incorporated together into a single device.

17. The system of claim 16 wherein the single device is a true wireless stereo (TWS) earbud.

18. The system of claim 17 wherein the first circuit is a microcontroller integrated inside a charging box for the TWS earbud.

19. The system of claim 17 wherein the TWS earbud detects if a charging power is present at the first single wire link when the TWS earbud is placed within a charge box, in response to the charging power is applied to first single wire link, the TWS earbud skips a power-up presence.